Imitation River Rock Hide-a-Key & Repositionable Vinyl Warning Decal Set Realistic looking, rough textured fake river rock with opening at the back that allows you to hide several keys inside Rock size: Approx. 2.5 inch wide x 3.5 inch long x 2.5 inch high. Hidden key compartment size: Approx. 1 inch wide x 2.25 inch long x 0.75" deep. Highly visible and repositionable vinyl warning decal w/ adhesive on front & printed side - Perfect for use on clear glass doors and windows Decal size: Approx. 2.5 inch diameter. To order additional warning decals, enter WDCL in search box.